You can use a gateway to coordinate different types of sensors. You can follow this link  to see the proposed implementation of WSN gateways

http://ieeexplore.ieee.org/search/searchresult.jsp?newsearch=true&queryText=WSN%20gateway

You can use an application layer protocol that handles various types of data, with the sensor id/type at header, and use any kind of sensor and just normalize the data based on definitions on header. You only need a table with all available sensors, its IDs and the type of data they work with. It is actually very simple.

Thank you very much Mr. Sadio and Mr.Oliveira